Portable repeater apparatus



A J. F. TOOMEY AND 0. G. SPENCER.

PORTABLE REPEA ER APPARATUS.

APPLICAHON FILED MAR. 22, 1919.

Patented May 24, 1921.

2 SHEEI S-SHEET l.

, Jliame 61 618 we! A TTORNEY J. F. TOOMEY AND C. G. SPEN CER.

PORTABLE REPEATER APPARATUS. APPLICAIION FILED MAR: 22, 1919.

Patented May 24, 1921'.

2 SHEETSSHEET 2 v &

I N V EN TORS ATTORNEY ew STATES QFFICE- JOHN a". TODMEY, 0F NEW YORK, N. Y, AND CHARLES G. SPENCER, OF EAST ORANGE,

NEW JERSEY, AssIGNoRs T0 AMERICAN. TELEPHONE AND. ,TEL GRAPH COM A .coasozea'rro on NEW YQRK,

' "Polar 5131.3 REPEATER APPARATUS.

To aZZtc/lom 'z'tmay/ comm: i

Be it known that we, JoHN F. TOUMEY and CHARLES G. Srnxcxngresiding at New York and East. Orange, in the counties of New York and Essex and States of Xew York and New Jersey, respectii'ely; have invented certain Iniprm'ements in Portable Repeater Apparatus; of which the following is a specification. p

This invention relates to telephone systems and more, particularly to repeater apparatus adapted to be associated therewith.

(onditions often arise in long distance telephony which make it expedient to install telephone repeater equipment temporarily I and, on very short notice, in order to give transnnssion improvement on special or einergencylong distance transmission lines.

Such conditions would arise where "it is such as artificial lines and testing apparatus, I

so that the set will be complete in itself, will be exceedingly portable. and may be speedily installed at points in a telephone system whenever a sudden need therefor arises. The invention also consists in providing a. repeater set suitable for use in connection with any of the usual typesof cord circuits at aiswitchlaiard and whiclrwill utilize'the supervisory signaling apparatus otsnch a cord circuit. Other and further phases of the invention will be cleartromthe'detailed descri ition of the invention, 1 I n 'lhe repeater set offthi s invention is niounted ina portable bos in which are in.- cluded the usual coils. artificial lines, potentioineters. relays and other apparatus needed to make there'peater set aconip'lete operatunit itself, Included in the boxand associated with the repeater set by means oi keys is a testing set for testing the operation i i: I slieciticationof lietters Patent. l atent d pl Application filed March '22,'--i919. Serial No. 284386? 1" of the" repeater; 'Conductors from the repeater boxare wired to one ofthe usual types of long distance cord circuits at the switchboardsg There is also;'mountd at the switchboard a repeater controlling key associated with relay apparatus in the repeater box, When this key is open a connection is completed through the longdista-nc cord circuit in the usual manner and when thekey is thrown the connection is completed through the repeater set. ,By operating another lever otthe repeater-key the operator is enabled to "connect her monitoring set with the repeater apparatus. Means are provided in the repeaterbox which are responsive to signaling currents and which serve 'to operate the supervisory signalsassociated with the long distance cord circuit. v I In the drawing the Figures 1 and 2 when taken together illustrate the circuit arrangements of the preferred form of the invention. 1

In Fig. 1 of the drawingis shown atype of long distance cord circuit A which is well known in the art. It is understood; however, that the repeater setiot this invention is suitable for use with other, types of long distance cord circuits. The long distance cordcircuit A terminates in the plugs P and 1 and includes the usual ringing key K a splitting key K and the monitoring and talking keys K and K respectively. i ssociated withthe keys K and K are the transformers 9 and 11,.the relay 10, and the jacks J whereby the operator's telephone setlLZ may be associated with the long dis tance 'cord' for purposes of monitoring or talking. iIncluded in a bridge acrosslthe talking conductors of the cord circuit is the relay 1 which responds to alternating signaling currents and controls the operation of the supervisory signal Included in a usual type of two element two wayrepeater a circuit diagram v including the vacuum bulb amplifiers A and A Associated with amplifiers A and A are the usual potentiometers, condensers, input and output windings and filament circuits. Connected to the input windings of amplifiers A, and A are conductors leading to the contacts of key K and then to artificial lines suitable for balancing lines interconnected by the repeater apparatus. Either a plurality of types of artificial lines may be provided suitable for balancing clifferent types of lines to be interconnected, or a single set of artificial lines may be provided as circumstances may require. Associated with other contacts of key K are artificial lines N, and X, suitable for balancing artificial lines N, and N, used when the repeater apparatus is being tested. Illustrated in Fig. 1 and preferably mounted at the switchboard is the repeater key K having the levers 13 and 14.. \Vhen lever 14 is operated the relay 15 responds and connects the operators telephone set 12 to conductors 16 and to the monitoring coils, which in turn are associated with the amplifiers A and A thereby allowing the operator to monitor on a connection through the repeater set. The operation of lever 13.

serves to operate relay means in the repeater box whereby the filament circuits of amplifiers A and A are closed, the amplifiers are conditioned for operation. the long distance cord circuit A is disconnected from eration of which a tone current or a signaling current may be transmitted through the amplifiers for testing purposes. Associated with the contacts of key K, are conductors leading to a telephone receiver, with which is associated a receiver shunt 82 including a variable series resistance '18 and a variable shunt resistance 17. Associated therewith is the key K, which serves to close a shunt about resistance 18 and also serves to disconnect the repeater set from the testing apparatus and to connect the cord circuit A in place thereof.

The invention may. now be more fully understood from the following description of its operation:

If a connection is established between two long distance lines by means of the cord Included in these conductors conductors 27, contacts of key K conductors 28, conductors 29, over the talking conductors of the cord A, over conductors 30, conductors 31, contacts of key K conductors 32, contacts of plug P and thence over the talking conductors of the line associated with plug P Ground will also be applied from the sleeve conductor of the line associated with plug P, over the sleeve contact of plug P,, sleeve conductor of plug P,, contact of key K conductor 33, armature and contact of relay 36, conductors 34 and 35, winding of relay 4, to battery and ground. The closing of this circuit will operate relay 4 and close the following circuit: from ground and battery, armature and contact of relay 4, conductors 83, 84, and 49. winding of relay 2, contact and armature of relay 1. to ground. The closing of this last mentioned circuit will operate relay 2 which by pulling up its armature will prevent the relay 3 from being energized and the supervisory signal 5 from functioning as will be pointed out later.

The operator by now throwing her listenink key K, may connect her telephone set 12 to the talking conductors of the cord A. The operation of key K closes the following circuit: from ground, contact of key K conductor 20, winding of relay 10, to battery and ground. The closing of this circuit will operate relay 10 which will pull up its armatures and connect the operators telephone set 12 to the talking conductors of cord A as follows: from the talking conductors of cord A, contacts of key k conductors 19, windings of transformer 9, conductors 21 and 22, armatures and contacts of relay 10, conductors 23, conductors 24, contacts of jacks J and plugs P to operators telephone set 12. If the operator ascertains that the connection is one which may be completed without the use of repeater apparatus, the connection will be completed between the lines over the cord circuit A in the usual well known manner which will not be described. However, it the operator finds that the connection is one in which it is desirable to employ repeater apparatus, the operator will throw lever 13 of the repeater key K Upon the operation of lever 13 the following circuits will beclosed: from ground and battery, conductor 47, contact .of key K, conductor 48, to junction point 49; from junction point 49, over' conductor 50,-winding of relay 3%, to ground; from junction point-49, over conductor51, to junction point 52; from junction point 52, about the winding of relay 37, over conductor 54, contact and armature of relay 45, conductor 55, contact and armature of relay 46, to ground; and from junction point 49, over conductor 63, winding of relay 44, to ground. The closin of these circuits will energize the relays 38, 36,

31, andLH. Uponthe energization of relay 371a circuit will also be closed fromjunctio'n point 52 through the winding of, relay. ;363 conductor 53, ;contact and armature ofrelay 37 :to ground thereby operating; relay? 36;".

v Upontheoperation of relay .36thelfollowing circuit will he closed: from ground applied? .to the sleeve conductor-of theline associated witlrplug P over-the sleeve conereuo ing of relay; 39,5

sleeye conductor of the, line :BSSQCIQ lugs? sleeve 1: contact of pl-11g z gnsleelve lowing circuit ,fi'om "conductor v of plug-1125,; contact oi. keyg-K conductor. 51?, armaturei'and contact oft relay 1 conductor 58,11 winding ofi relay A05 to battery? and; ground. K The, closing .loiiv these two; lastimentioned circuits will operate relgg; g9jq a ndfil Q- operationg-of 1 relayi39 5-;1 (:19. h e .follo g circuit froms ground andbattery, viin'ding'aof relay 141'; conductor 59;,anma-ture andcohtactof relay 39, condllQ lpI'ifi Ojwindln t f relay ,1210 ground.

'fopera'tiom offers, 21 -1140 closes the followinglcirculti. from ground ai-idsbattery Winding of relay 41, conductor 61, armature and contact ofrelay: 40,,conductor 62, wind-- ing. of: relay 43;, toiground; The closingof these: two last ment onedcircuits will energize the, relay 41: and the. relays 42 end; 43.

The 1 'P re @n r 1i y 1-a erv e-t -l pe short: circuits across; t eginpuh'paths ofila'nrplifie'rs A jand A- -1wh h, together i-withlthfe af rem'entionedoperationof lrelayAl, which closesethe-. filament circuitsiforlsaiid amplirat'us; therefor 1.1;- 2' y The n operation ofrelaysj =42 and 43 serv, to disconnectuconductors 29 1and con ductoi 30.;from eonductors 28pand conductors f31; respectiyuelyt -and connect. the -cir cuitsfythe amplifiersglA and; A; to con (incisor-s28 and conductors '311; ,.--therebfy disconnecting the cord' circui t'iA from said conductorsiand' substituting the repeater appaj.Up r)nEthe energizat io olirelay '36 the previous y: aced c1r' ifb li -th wind n of rela 4 whioh;,.eontroll ed theisupervisory apparatus" iassoeiatd' With-cord A; willlbe opened A However, circuit for the relay- 4 willibe coinpleted upon the operationof-relayv38 vas follows: from ground and battery, waindingaof relays;,conductors s35 and 34, conductor 64,1 Contact and armature o frelay 38,2; conductor (55,;conductor fifilmzi'stance elements .67, t q groundg 5Acco1rdingl When the repeaterset subst tuted for t e cord circuit-A, the relay; :will still remain: enerv gized and the supervisory apparatus under ltS control will still be aval able? for use.

The operation of relay 38 by means of its upper armature; and contact also serves to ma ntain-"thereby 68 and the supervisory apparatusy..assooiatediwith the othe end of cordnA int a condition for operation. A talking circuit between the transmission lines will now becompletedthrough the repeater set as follows from the talking conductors of the line associated with the plug P contactsof plug P conductors 27, contacts of key K conductors 28, contacts andarmatlltjSEj-Qf'vlel-glykflzl over input and output I c rcu ts of iampl fierA armatures and con-r K g; conduetors 32, contacts of plug P conductors28;conductors 29 talking coni ductors of coriduA -and thencezover conductors 69;.bridged across said talking r-conductors,; anIdY about. the windings of relay. 1. As the relazy l is responsive to, alternating transmitted from such a line it will respond thereto and open the circuit formerly closed through the relay 2; ;thereby denergizing relay 2. .;Up,onthe deene'rgization of relay 2', the following circuit-will be closed 2 from 1 100 groundandbattery;armature and contact-of relay nemdtmmm 83 and 84 winding of relayfi, conductor 7 0, cOntactandarmature of "relayfl. conductors 71, 72janclv 73, contact of key K conductoru't'l to; ground. ,If the splitting keyK 1 and the', talking key K shouljdboth ibeopened atthistime. this lastmentioned}; circuit willg becompleted las 'follows: from conductor 72,contact of-ikey IQ' overconductor 75, to ground. The closin ofifztfhgis-circuit; willzoperate the relay 3 which willlpull'upjits upper armature and will become lockedlup over; its upper contact. and armature EJThe-QperatiQnofgthe relay 3 also closethe [following circuit. for the supervisory lamps; from ground and hat.- tery,; armat11reand contactof relay 4, conductor 83,7filamentof signal lam" 5. 0011- duetor 76,, con-tact and armature o I relay 3, over,cond'uctQrwTQJ-and thence to ground as previously pointed out,

; 5 lf when ia conn'ection ls-established between two long distance lines and the repeater set is being used in place ofthe cord circuit A, ringing current-coming in over 1 one of the long distance lines; such as the line associatedfiwith z-plug P will be transmitted; overcthe following .path: from the talkingiconductorsof theline, over the tip -ringinglcurrentsof the type which would be and ring contacts of plugfP over conductors 27, contacts of key K conductors 28,

and thence over conductors 77 bridged across conductors 28, and through the windings of the relay 15. As the relay 45 is responsive to ringing currents of this type, it will pull up its armature and open the circuit formerly completed upon the operation of lever 13 of the repeated key K through the winding of relay 37. The opening of this circuit will deenergize relay 37 which will, in turn, cause the deenergization of relay 36, of relays 39 and 40 and of relays 42 and 43. The de'e'nergization of relays 42 and 43 will disconnectthe repeater apparatus from conductors 28 and 31 and will conncct said conductors to conductors 29 and 30 respectively. The ringing current coming in from the 2 line will now be transmitted over conductors 29 to the cord circuit A and will operate the supervisory means associated therewith in the manner previously pointed out. Bridged across conductors 31 is the relay 46 similar to the relay 45 and which will respond to ringing currents coming in over a long distance line associated with the plug P and which will serve in a manner similar to the relay 45 to cause the repeater set to be disconnected from conductors 31 and will connect conductors 30 to conductors 31 so that the ringing currents will operate the supervisory means in the cord A.

If a. connection is established between two long distance lines and the repeater set is being employed in connection with the cord circuit A, the operator, if she desires to monitor on such a connection, will throw lever 14 of the key K,,. This will close the following circuit: from ground and battery, contact of key K conductor 78, winding of relay 15 to ground. This will operate relay l5 and connect conductors 2-1 leading to the ()perator's telephone set 12 to theconductors 16. The conductors 16, in turn, are connected to conductors .T9and 80 which are inductively related to the monitoring windings of the vacuum bulbs A, and A respectively. Accordingly by operating the lever H. the operator will be enabled to monitor on a connection made through the repeater Set.

If it is desired to test the apparatus of the repeater set. the keys K and K are thrown and the conductors 28 and 31 are disconnected from the conductors leading to plugs 1 and P respectively and are connected to conductors 9 and 91 leading to the testin apparatus. Lever 13 of the repeater key Ix, is also thrown and the repeater set is thereby connected to conductors 28 and 31 in a manner similar to that already pointed out ex-- relay 3G, conductor 33, contact of key K conductors 97 and 98, contact of key K con.- ductor 99, to ground; and from ground and battery, winding of relay 40, conductor 58, contact and armature of relay'36, conductor 57, contact of key K conductor 100, conductor 98, contact of key K conductor 99, to ground. The key K is now thrown and the above traced circuits through relays 39 and 40 are opened at the contact of key K Upon the denergization of relays 39 and 10 the repeater set is disconnected from conductors 28 and 31 and conductors 28 and 31 are connected to conductors 29 and 30 re spectively leading to the cord circuit A. The key K will now be thrown and either a source of ringing current or of tone current may be applied to conductors 92. This testing current will be transmitted over the following ath: from conductors 92, contacts of key K conductors 90, contacts of key K conductors 28, conductors 29, over the talking conductors of cord circuit A, conductors 30, conductors 31, contacts of key K conductors 91, contacts of key K., and thence over conductors 95 and 96, and the short circuit formed by contact of key K to the telephone receiver. After observing the guality of the tone in the receiver, the key is restored to normal again. This will complete the formerly traced circuits for relays 39 and 40 which upon becoming energized will cause the repeater set to be connected to conductors 28 and 31 and will disconnect conductors 29 and 30 from conductors 28 and 31 respectively. as has been formerly pointed out. The testing current applied to conductors 92 by the aforementioned operation of key K will now be transmitted over the following path; from conductors 92, contacts of key K conductors 90, contacts of key K conductors 28, through the repeater set, over conductors 31, contacts of key K over conductors 91, contacts of key over conductors 95 and 96, and through the receiver shunt 18, to the telephone receiver. The receiver shunt will now be adjusted until the quality of the sound heard in the receiver is the same as in the case when the testingcurrent was transmitted through the cord circuit A. The reading on the indicating means of the receiver shunt will now show the transmission gain due to the including of the repeater apparatus in the circuit. It is to be noted that when the repeater ap aratus is being thus tested the key K shou d be operated so that the networks N, and N suitable forbalancing the artificial lines N and N may be associated with the amplifiers A and 2. respectively. .Furthermore by operating the key K the testing current may be transmitted through the repeater set or the cord circuit A in either direction desired. While the invention has been disclosed as embodied in certain specific arrangements which have been deemed desirable, it is to understood that it is capable of embodiment in many and widely varied forms without departing from the spirit of the invention as defined in the appended claims.

What is claimed is:

1. In a telephone system, a cord circuit for interconnecting transmission lines, supervisory signaling apparatus associated with the terminal arrangemen s of said cord circuit, means responding when one of said terminal arrangements is associated with a transmission line for rendering said supervisory signaling apparatus in a condition for operation, a repeater set associated with the terminal arrangements of said cord circuit, switching means whereby said cord circuitmay be disconnected from said terminal arrangements and said repeater set may be connected to said terminal arrangements, and means insaid repeater set responding when said cord circuit is disconnected from said terminal arrangements for maintaining said supervisory signaling apparatus in a condition for operation.

2. Ina telephone system, a cord circuit for interconnecting transmission lines, supervisory signaling apparatus associated therewith, a repeater set associated with the terminal arrangements of said cord circuit, switching means whereby said repeater set may be connected to said terminal arrange-' ments in place of said cord circuit, means in said repeater set responsive to signaling currents when said repeater set is connected to said terminal arrangements for connecting said cord circuit to said terminals in place of said repeater set.

3. In a telephone system, a cord circuit for interconnecting transmission lines, supervisory apparatus associated therewith and responsive to signaling currents transmitted over said lines when said lines are interconnected by said cord circuit, a repeater set for interconnecting said lines independently of said cord circuit, relay means in said repeater set and responsive to signaling currents transmitted over said lines when said lines are interconnected by said repeater set, and meanscontrolled by said relay means for causing said supervisory apparatus to be operated.

at. A cord circuit located at a switchboard, supervisory apparatus associated with the terminal arrangements of said cord circuit, means responding when one of said terminal arrangements is associated with a transmission line for rendering said supervisory apparatus in a condition for operation, a repeater set included in a portable box and adapted to be located in a position separate from said switchboard, means for associating said repeater set with the terminal arrangements of said cord circuit, switching means at said switchboard whereby said cord circuit may be disconnected from said terminal arrangements and said repeater set may be connected to said terminal arrangements, and relay means in said portable repeater box responding when said cord circuit is disconnected from said terminal arrangements for maintaining said supervisory 

